- Gary L. Matthews. Challenge of Baha'u'llah, The: Proofs of the Bahá'í Revelation (1993). Link to book (offsite). Books.
- Gary L. Matthews. Searching Eye, The: The Independent Investigation of Truth (1989-09). Concepts informing the personal search for truth: the role of faith, the trap of imitation, the role of justice, the impact on unity, the oneness of truth, and the scientific method. Essays.
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